Journal
ACS APPLIED ENERGY MATERIALS
Volume 3, Issue 12, Pages 11981-11991Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.0c02165
Keywords
small band gap nonfullerene small-molecule acceptor; organic solar cells; low energy loss; solvent vapor annealing; power conversion efficiency
Funding
- National Key Research & Development Projects of China [2017YFA0206600]
- National Natural Science Foundation of China (NSFC) [21875286]
- DST through the INDO-Russia project
- Hellenic Foundation for Research and Innovation (HFRI)
- General Secretariat for Research and Technology (GSRT) [1536]
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The recent emergence of small acceptor molecules that are nonfullerene (NFSMAs) of A-DAD-A type, particularly Y6, has accounted for the effective organic solar cells (OSCs). A new acceptor derivative denoted as Y18-DMO using 3,7-dimethyloctyl instead of 2-ethylhexyl on pyrroles of Y18 is reported. Y18-DMO shows the optical gap of 1.37 eV, with the highest occupied and lowest unoccupied molecular orbital energy levels at -5.86 and -3.90 eV, respectively. PBDB-T:Y18-DMO-based photovoltaic devices treated for 40 s by solvent vapor annealing in tetrahydrofuran (THF) yield a power conversion efficiency that reaches 14.18%, which is around the maximum efficiencies among the PBDB-T-based OSCs so far. Besides, these devices exhibit an energy loss as low as 0.55 eV while achieving a large open-circuit voltage of 0.81 V.
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